[填空题]Many scientists are deeply dedicated to the development of science, and their written account of their life __________________________ (将是给后代的一份珍贵礼物)

[填空题]Many scientists are deeply dedicated to the development of science, and their written account of their life __________________________ (将是给后代的一份珍贵礼物)

[填空题]What do scientists think of dreams
Many scientists believe that dreams are （）.

[单项选择]Scientists now believe that many, if not all, living things are born with some type of hidden clock. These clocks are sometimes set by the number of hours of light or darkness in a day, by the rhythm of the tides or by the seasons. One of the most remarkable of nature’s living clocks belongs to the fiddler crab, that familiar beach-dweller with the overgrown claw. Biologists have long known that the crab’s shell is darkest during the day, grows pale in late afternoon, then begins to darken again at daybreak. This daytime darkening is valuable for protection against enemies and sunlight, and for many years it was thought to be a simple response by the crab to the sun--just as if we were to get a tan during the day and lose it at night. But when an enterprising scientist placed a fiddler crab in darkness, he was amazed to find that the color of the crab’s shell kept ticking off the time with the same accuracy. Yet another startling fact was revealed: the crab’s shell re
A. the fiddler crab’s shell reached the darkest color at the same time in Cape Cod, Massachusetts and its neighboring island
B. the fiddler crab continued to change color in the dark
C. plants will not grow without sunlight
D. all of the above

[单项选择]Scientists say that many factors （　） changes in the weather.
A. bring in
B. bring off
C. bring about
D. bring forward

[填空题]Scientists from many countries agree that the recent warming is caused in part by such human activities as man’s ever-increasing consumption of gas or oil.

[简答题]According to scientists, many people believe that physical cleanliness is strongly linked to ______.

[单项选择]To scientists, the information contained in many threatened languages is （　）.
A. mysterious
B. terrifying
C. exciting
D. overwhelming

[单项选择]Before 1965 many scientists pictured the circulation of the ocean’s water mass as consisting of large slow-moving currents, such as the Gulf Stream. That view, based on 100 years of observations made around the globe, produced only a rough approximation of the true circulation. But in the 1950s and the 1960s, researchers began to employ newly developed techniques and equipment including subsurface floats that move with ocean current and emit identification signals for months at fixed locations in the ocean. These instruments disclosed an unexpected level of variability in the’ deep ocean. Rather than being characterized by smooth, large-scale currents that change seasonally (if at all), the seas are dominated by what oceanographers (海洋研究者) call mesoscale fields (紊流): fluctuating, energetic flows whose velocity can reach ten times of the mean velocity of the majior currents.
Mesoscale phenomena--the oceanic analogue of weather terms--often extend to distances of 100 kilometers an
A. the brief duration of weather pattern
B. the variability of the mesoscale phenomena
C. the difficulty of measuring the ocean’s large-scale currents
D. the possible impact of mesoscale fields on weather conditions